dhis2-users team mailing list archive

["Jason Phillips" <jason@xxxxxxxx>]

Hi Bob,

Thanks for your reply.  I found I had to disable the static content serving
to make nginx work, at least in the config I ended up with.   Clearly, there
are a lot of improvements I can make to our location settings, and nginx is
certainly both very powerful and flexible.  Spent quite a bit of time
reading through the Pitfalls, documentation, etc.  The "thing" already
listening on port 80 was nginx itself, since the original .conf changes I
had tried to duplicate from dhis2.org were still there - once I removed
them, my problem went away - but I will remember the netstat trick for next
time.

 

Kind regards,

Jason.

 

From: Bob Jolliffe [mailto:bobjolliffe@xxxxxxxxx] 
Sent: 24 March 2014 11:54 AM
To: Jason Phillips
Cc: dhis2-users
Subject: Re: [Dhis2-users] nginx Reverse Proxy Config for Dedicated Web
Server with multiple instances

 

Hi Jason

 

You can't fix your problem with nginx config without first addressing your
bind error.  The error is simple enough - it just means something else is
already listening on port 80.  

 

So try this:

sudo netstat -ntlp |grep ':80'

 

which will show you in the last column what exactly is listening on 80.
Most probably apache or another nginx.

 

I am also not in favour of the approach described in our manual for serving
static content, but that is something you can look at after.  It has two
serious downsides that (i) the nginx is bound to the same filesystem as the
tomcat application server and (ii) you can only pull that "trick" with one
tomcat backend.  Both of which are unreasonable.  What I prefer and the way
it is done in the dhis2-tools is to customize the tomcat web.xml and enable
caching on nginx so that all the static content get's cached - that way
nginx effectively will serve them as static files anyway.

 

Regards

Bob

 

On 23 March 2014 08:10, Jason Phillips <jason@xxxxxxxx> wrote:

Hello all,

 

I am trying to set up nginx as a reverse proxy on a dedicated web server
with three instances of Tomcat/DHIS2 (connecting to a dedicated Db Server,
successfully configured and checked).

I have been unable to make nginx behave as required, after numerous
different configurations, and hours of trawling the 'Net.

 

Attempting to following the instructions on dhis2.org resulted in bind
errors ([emerg] bind() to 0.0.0.0:80 failed (98: address already in use)),
and after several variations I tried setting up a simple reverse proxy
following the instructions on howtoforge.com at this link
<http://www.howtoforge.com/how-to-set-up-nginx-as-a-reverse-proxy-for-apache
2-on-ubuntu-12.04> .  I now have arrived at the same place, albeit by a
slightly different path, and am getting those bind errors again.  I have
even shut down all three Tomcats and removed and purged Apache (in case it
was somehow interfering, which it apparently is not).

 

The domain dhmis.org has a DNS entry for dhis, za.dhis and train.dhis
pointing to the server's IP.

My current configuration includes a file in /etc/nginx/site-available called
"dhmis.org.vhost", which is linked to the ./sites-enabled folder.  Herewith
its contents:

 

server {

        listen 80;

        server_name www.dhmis.org dhmis.org; # Have put in za.dhis.dhmis.org
and variations here.

        root /home/hisp/tomcat-dhis2-1/webapps/zanat/; # Have tried ROOT
here too!

 

        # Serve static content

        location ~
(\.js$|\.css$|\.gif$|\.woff$|\.ttf$|\.eot$|\.ico$|^/images/|^/icons/|^/dhis-
web-commons/.*\.png$) {

        add_header  Cache-Control  public;

        expires  7d;

        }

 

        # Proxy pass to servlet container

 

        location / {

                proxy_pass http://localhost:8080/; # Have added 8080/zanat
as variations here.

                include /etc/nginx/proxy_params;

        }

}

 

What am I doing wrong?

 

Kind regards,

Jason Phillips

 



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